666052972125 has 32 divisors (see below), whose sum is σ = 1156499645184. Its totient is φ = 339783540800.

The previous prime is 666052972121. The next prime is 666052972159. The reversal of 666052972125 is 521279250666.

It is a happy number.

It is not a de Polignac number, because 666052972125 - 2² = 666052972121 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666052972121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 38603142 + ... + 38620391.

It is an arithmetic number, because the mean of its divisors is an integer number (36140613912).

Almost surely, 2^666052972125 is an apocalyptic number.

It is an amenable number.

666052972125 is a deficient number, since it is larger than the sum of its proper divisors (490446673059).

666052972125 is a wasteful number, since it uses less digits than its factorization.

666052972125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77223574 (or 77223564 counting only the distinct ones).

The product of its (nonzero) digits is 2721600, while the sum is 51.

The spelling of 666052972125 in words is "six hundred sixty-six billion, fifty-two million, nine hundred seventy-two thousand, one hundred twenty-five".